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GHSA-hc4m-q9jh-xw4j

MediumCVSS 6.6 / 10
Published Jul 28, 2026·Last modified Jul 28, 2026
Affected Components(0)

No affected components available

Description

Summary

Registry-installed nono packs are expected to be verified from local provenance metadata before they are used. Two files are relevant:

  • ~/.config/nono/packages/lockfile.json
  • ~/.config/nono/packages/<namespace>/<pack>/.nono-trust.bundle

Testing shows that nono fails closed when a pack has a trust bundle but no lockfile entry. However, if the trust bundle is also absent, the same pack can load successfully. Deleting security metadata should not make a pack easier to run.

Affected behavior

Observed with always-further/claude:

  1. Delete ~/.config/nono/packages/lockfile.json.

    Result:

    nono: Package verification failed for always-further/claude: pack 'always-further/claude' has a trust bundle but no lockfile entry - reinstall with: nono pull always-further/claude --force

  2. Delete ~/.config/nono/packages/always-further/claude/.nono-trust.bundle.

    Result: the profile loads successfully.

  3. Restore .nono-trust.bundle while the lockfile is still absent.

    Result:

    nono: Package verification failed for always-further/claude: pack 'always-further/claude' has a trust bundle but no lockfile entry - reinstall with: nono pull always-further/claude --force

Impact

If both the lockfile entry and trust bundle are absent, nono may accept an installed registry pack without artifact hash verification or provenance verification.

This is especially important for pack-provided session hooks, because session hooks execute on the host outside the sandbox. A pack that contributes host-executed code should not run unless nono can verify that the code is a locked and trusted pack artifact.

Root cause

verify_profile_packs treats the lockfile entry as optional. Existing code fails when a trust bundle exists without a matching lockfile entry, but when the trust bundle is absent too, there is no equivalent hard failure.

That creates a fail-open state:

  • lockfile entry missing
  • trust bundle missing
  • pack directory still present
  • profile can load

Recommended fix

For any registry pack selected for execution, require both:

  1. A matching lockfile entry in ~/.config/nono/packages/lockfile.json.
  2. A present and valid .nono-trust.bundle in the installed pack directory.

If either is missing, fail closed with a reinstall instruction, for example:

reinstall with: nono pull <namespace>/<pack> --force

This keeps verification monotonic: removing provenance metadata cannot downgrade a verification failure into a successful launch.

Risk Scores
Base Score
6.6

The vulnerability requires local access to the device to be exploited. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. The attacker needs the user to perform some action, like clicking a link. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data.

Threat Intelligence
6.1

Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.

EPSS
N/A

Probability that this vulnerability will be exploited in the wild within the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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Medium severity
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